Features4 x AAA batteries1.2 VNi-MHSupplied ready to useStay charged for over one yearNew generation technology Duracell Ultra Rechargeable AAA Batteries stay charged for longer, helping you to recharge less often. Ideal for wireless mice, torches, remote control. PreCharged batteries have very low self-discharge, the same as normal Alkaline batteries. That is why the batteries in this package are ready for use when taken out of the pack. They are pre-charged and and ready for use even after 1 year in the pack, they are still ready for use!PreCharged batteries can be charged 1000 times. Which is great for the environment and your pocket.